Control group and variable ? for the "penny lab" (how many drops of water can fit on a penny ?)?

Hi, my teacher made us do the "Penny Lab"


and we had to write an inquiring question:


How many drops of H2O will fit on a penny (tail side)(one-inch height) and other things for labs.





and anyways our homework she says is:


"Establish your Control with materials available to you at home. Do 10 trials for control. Then change one variable and do 10 trials again. To add to your already completed lab write up add the following things and bring it to class on Monday:


- 5 more research questions pertaining to your variable.( So you should have total of 15 questions and answers)


-two hypotheses, one for control and one for new variable


-Rewrite your Experiment under 3 titles: Materials


Procedure, Labelled diagram"





i don't understand what the variable and control group is, i am planning to change the 'dropper' to a water bottle with a hole in it though. so is that the variable that is changed? i'm confused as to what 5 questions too. So if anyone can help, thanks :)|||Your constant would be the one thing that is constant in all the repetitions of the experiment, ie, you use the same penny for all the repetitions, use only distilled water for all repetitions, same dropper, etc. Your variable could be using differnt pennies for the repetitions, different contaminants in precise concentrations for the repetitions, temperature variations, etc. Your control GROUP would be the first group of repetitions where you used the distilled H2O at a constant temperature on the same penny, from the same dropper, recorded each result, then averaged the results for that set. This is introducing the concept of scientific research, where you determine the effects of a variable on a system.|||Did you have Mrs. Sabherwal for Biology???

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|||they are not always exact because my freind says 43 and i say 14-16 drops and we both did we both did expiriments on the subject!


hope i helped you in some way!


-Mia Elledge %26amp; Porshay August|||Independent Variable is the thing you change in the experiment ex: H2O to vinager or other liquid substance. Dependent variable is what changes because of you changing something.


Control could be the temperature of the water or other liquid it should be a constant. What you use to drop the water on the penny, the angle in which you hold the dropper, or the heighth you drop from etc... My 8th grade students just did this lab in class last week.